Carburetor



M. GOUDARD CARBURETOR l Filed Aug. 2l, 1925 *Zwe/e for' (r/WW 12772;

' l azi/Orne@ atented ipr., 2g? w3@ MAURICE GGUDRD, OF NEUILLY SUR SENE, FRANCE CARBURETR [application filed August 221, 1925, Serial No. 51,649, and in Belgium June 6, 1955.

This invention relates to carburetors of the type comprising a fuel overflow chamber or its equivalent and one or more nozzles and more particularly to a carburetor in which,

during operation, variations are produced between the level of the fuel in the fuel over- `tlow chamber or its equivalent on the one hand, and the orifice or orifices of the nozzle` or nozzles on the other hand.

rlhe improvements according to the invention are designed with the object oi? producing carburetors of the class in question which are adapted to function in a more practical manner than has hitherto beenthe case.

A carburetor constructed according to the invention is provided with atleast one nozzle opening into the mining chamber at the same level as the normal level of the liquid fuel in the overflow chamber or its equivalent, and 2@ includes means for automatically producing at any desired time a variation in the level of the fuel in the overiow chamber in such a way that the fuel will flow freely through the nozzle opening even if it is not exposed to the suction ofi the engine.

The invention also includes -further constructional details which may be utilized in conjunction with the beforementioned principal arrangement or separately.

According to the invention, the means for varying the relative hei hts of the nozzle opening and of the liqui is controlled as a vfunc-tion of the variations of the position of the throttle, so that the most eilicient carburation ma be automatically ensured, and so that-in t e case of carburetors having a plurality of nozzles the supply of fuiel may take lace under satisfactory conditions during tige periods between which one of the nozzles goes into or out of operation.

Means are provided for instantly raising the level of the fuel with respect to the nozzle opening, where a sudden acceleration or speeding up is required.

The invention further includes various other construotional details and arrangements which will be more fully described hereafter.

ln order that the invention may be clearly u derstood, it will now be ex lained with A 5@ s ference to the accompanying rawings, but

it is to be observed that the description and drawings are given merely by way of example.

Figure l is a vertical central sectional view through the present carburetor, and

Figure 2 is an enlarged detail sectional view of the means -for extending the height of the constant level chamber.

Referring to Fig. l, the carburetor comprises in the ordinary way a principal nozzle a opening into the mixing chamber 25 of the engine, below the throttle c. ln the present invention, fuel is admitted from a conduit j communicating through the interior of the apparatus with a vertical tube jl, the upper edge of which tube is at a height at which the level of the fuel is to be maintained under normal conditions. rlhe fuel passing up the tube jl overflows into the chamber do and returns through a pipe to the fuel reservoir. Between the inlet tube j and the tube jl is an obturating device, consisting of a needle Z. This prevents the fuel from running 'from the reservoir up the passage 7" when the engine is stopped. do are channels 7 leading to the nozzle or nozzles, for instance to the principal nozzle a and to the slow speed nozzle m, in the construction shown.

A. number oi' short axially alined tubes, of which two, d2 and d3 are shown, are mounted in the chamber d in such a way that the tube all can be moved downwardly to seat its lower end upon the upper end of the tube jl to form an extension of the latter, and similarly that the tube de can be moved downwardly to seat its lower end upon the upper end of the tube dz to form an extension of y the latter in order to extend the height ot the tube j and thus control the hydrostatic pressure of the Huid supplied to the nozzle a and m.

The lower end of the tube all is dared in order `that it may fit over the upper end of the tube j', and the lower end of the tube di is similarly liared in order that it may tit over the upper end of the tube all.

A tubular guiding member d20 has its lower end turned inwardly and secured to the tube d2 and has its upper end extending above the upper end of the tube all. apertures y and z formed in the tubular member d20 adjacent its bottom permit the escape from said member to the chamber do of fuel overflowing from the upper end of the tube d2 when the lower'end of the latter is moved down over the upper end of the tube j or from the upper end of the tube d3 when the tubes-d2 and Z3 are both moved downwardly to seat their lower ends upon the upper ends of the tubes jl and d2, respectively. The tubes cl2 and da may with advantage be operated from the throttle c, by mounting on the spindle of the said throttle a cam c1 for operating a lever n fulcrumed on the carburetor casing.v This lever in turn operates through the intervention of springs o, p, and g, the tubes (Z2-and cl3, the spring 0 being interposed between the lever n and a projecting portion on the tube d3, the spring p being mounted between the projectingportion on the tube d3 and the bottom of the tubular member d20, and the spring g being mounted between the bottom of the tubular member. Wand the bottom of the chamber d". Moreover, the springs are so proportioned that, for a determined opening of the throttle c, the tubular member d2 comes down upon the tube jl and adds to its length, this being an intermediate position of the throttle tion on one side wtih the atmosphere, and

on the other with the mixing chamber above the throttle. connected with the obturator that when the engine is starting up or running at slow speed with the throttle closed, the suction of the engine upon the face of the piston in communication with the induction pipe above the throttle, causes the piston to rise and thus opens the obturator. The opening of the obturator is ensured, when the throttle is opened, by the action of the lever n on the piston 1' through a spring s.

In addition to the foregoing construction which gives excellent practical results, it may in some cases be desirable to adopt some or all of' the following arrangements. v

In the case of a carburetor with a plurality of nozzles means may be provided'for regulati'ng the height of the nozzle orifice with respect to the normal level of fuel in the reservoir.

For instance with the carburetor having a principal -nozzle and a slow speed nozzle, the point at` which they come into action The said piston is so intermay be regulated-by prdviding a Icap adapted to screw on to the nozzle so as to regulate the height of the nozzle with res ect to the level of fuel in theoveriiow cham er..-A

There may be combined with the nozzles a' vmV and m receptacles t and t', edapted',respec tively, to collect any fuel flowing .from the corresponding nozzle. The bottom of the receptacle t is in connection with the mixing chamber above the throttle through a passage u. With this arrangement in starting up when the engine is cold, it is suihcient to reduce, by hand, a momentary rise of the evel of the fuel, by manipulating the throttle for instance, or, as shown at Fig. 1 by 80 actuatingv a lever o of which' one arm bears upon the upper end of the Vtubular member d2". l

The carburetorA operates inthe-following way: As the throttle opens, cam ell actuatess5 lever n, bringing pressure to bear ori-spring o and successively seating sections d2' and da,

.the fuel overflowing from the latter passing out through the apertures y and z of the tubular member d20 into the chamber d0 and `eo being drained off through overflow conduit k. The overflow' from nozzle a is caught in basin t and issucked up through bypass u at starting. If it'be desired to provide an extra head of fuel at starting, lever o is actuated to depress section d2. The feed of fuel' to chamber do is under the control of valve stem l actuated by assembly s, fr, doof. At starting, the suction exerted in lifts piston 1 and permits fuel .to pass into the nozzle too and into chamber d". During operation, piston r is lifted in the manner already described in another part ofthe specification.`

. What I claim and desire to secure by Letters Patent of the United States of America 1. A .carburetor including archamber land 'I fuel supply means including anv overliow tube in said chamber, a mixing chamber, a throttle, a nozzle extending into the mixing cham- 11o ber and connected to said overflow tube, and

means'operable by the movement of the throttle to extend the height of the overflow tube.

2. A carburetor including a throttle, a mixing chamber, a nozzle extending into said mixing chamber, means for controlling the hydrostatic pressure of fuel supplied to said nozzle, said means comprising 'a fuel chamber, sections in said fuel chamber communicating with said nozzle, and means operable ,lao

by movement of the throttle for moving said sections into contact with one another.

3. The combination set forth in claim 2 including resilient means opposing the action of the throttle and tending to keep the seci a plurality of sections and communicating 3.30

springs for holding said sections separated,.

the springs being operated upon by the throttle to place the sections in continuity successively, said tubular sections being variously spaced, whereby the two loWermost sections engage first and the remaining ones in successlon. 4

6. A carburetor including a chamber, overflow means in said chamber, a mixin chamber, a throttle, a nozzle connected to said over- -How means and extending into the mixing chamber, and means for controlling the height of said overflow means comprising a plurality of superposed tubular sections, the lowermost section being fixed and the others movable and spaced from the lowermost and the one above, a plurality of springs, one to each movable section, for holding the movable sections spaced, and resilient means interposed between the throttle and the uppermost section, whereby as the upper spring is depressed bythe throttle the other springs are depressed and the sections are successively placed into Contact, the lowermost being the first to be contacted.

In testimony whereof I have hereunto set my hand.

MAURICE GOUDARD. 

